x1,y1,x2,y2=map(lambda x:float(x),input().split(" "))
print(((x1-x2)**2.0+(y1-y2)**2.0)**0.5) x1,y1,x2,y2=map(lambda x:float(x),input().split(" ")) x1 map(lambda x:float(x),input().split(" ")) map lambda x:float(x) float(x) float x x input().split(" ") ().split () input split " " y1 x2 y2 print(((x1-x2)**2.0+(y1-y2)**2.0)**0.5) print ((x1-x2)**2.0+(y1-y2)**2.0)**0.5 (x1-x2)**2.0+(y1-y2)**2.0 (x1-x2)**2.0 x1-x2 x1 x2 2.0 (y1-y2)**2.0 y1-y2 y1 y2 2.0 0.5 x1,y1,x2,y2=map(lambda x:float(x),input().split(" ")) map(lambda x:float(x),input().split(" ")) x1 y1,x2,y2=map(lambda x:float(x),input().split(" ")) map(lambda x:float(x),input().split(" ")) y1 x2,y2=map(lambda x:float(x),input().split(" ")) map(lambda x:float(x),input().split(" ")) x2 y2=map(lambda x:float(x),input().split(" ")) map(lambda x:float(x),input().split(" ")) y2
x1,y1,x2,y2=map(lambda x:float(x),input().split(" "))
print(((x1-x2)**2.0+(y1-y2)**2.0)**0.5)